8 | General Recommendations
Thermo Fisher Scientific ULT Freezers
General Recommendations
Temperature Monitoring
system
General Usage
This refrigeration system is designed to maintain ultra-low
temperatures with safety in an ambient environment within
15°C to 32°C (59°F to 90°F), only when the freezer is used for
storage.
Avoid opening the door for extended time periods since
chamber temperature air will escape rapidly. Also, keep the
inner doors/sublids closed as much as possible. When room
air, which is higher in humidity, replaces chamber air, frost
may develop in the chamber more rapidly.
Initial Loading
Allow the freezer to operate at the desired temperature for a
minimum of 12 hours before loading.
•
Load the freezer one shelf at a time, beginning with the
bottom. After loading each shelf, allow the freezer to
recover to the desired set point before loading the next
shelf. Repeat this process until the freezer is fully loaded.
•
Fill a chest by starting at the left side near the probe.
Filling with room temperature racks will result in a long
pull-down time.
Grille Door Opening/
Closing
To open the grille door, pull the door from the left as shown in
the figure below.
To close the grille door, push the door against frame to hold
latch in position.
Figure 1. Door Opening
IMPORTANT NOTE:
Thermo Fisher Scientific
recommends the use of a redundant and
independent temperature monitoring system so
that the freezer can be monitored continuously
for performance commensurate with the value of
product stored.
WARNING:
This unit is not a “rapid-freeze”
device. Freezing large quantities of liquid, or
high-water content items, will temporarily
increase the chamber temperature and will cause
the compressors to operate for a prolonged time
period.
CAUTION:
Failure to follow these procedures or
overloading the unit may cause undue stress on
the compressors or jeopardize user product
safety.
